Problems thickening

Hi there,

Im Pretty new to solidworks but iv been using it on an off for two years or so.

Im trying to thicken a case for a sugrical staple gun but i am getting numerous errors when i try to do it, i want to thicken the case outwards by 5mm.

I appreciate that there may be an issue with some of my curves having a radius too small? I would appreciate it if someone could quickly look at my part file and maybe point me in the right direction to fix the problem.

Im hoping there is a quick way to thicken without using the thickening tool.

I understand this is  a fairly common question but im really having some difficulty so i appreciate an support!

SolidworksParts And Features